\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{HC transparency index -- Subcomponents}
\begin{tabular}{l*{6}{c}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}&\multicolumn{1}{c}{(6)}\\
                    &\multicolumn{1}{c}{\textbf{\begin{tabular}[c]{@{}c@{}}HC\\transparency\\index\end{tabular}}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}Poster with\\opening times\end{tabular}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}Duty roster\\displayed\end{tabular}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}Suggestion\\box\end{tabular}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}Info\\on services\\provided\end{tabular}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}Info\\on patient\\rights\end{tabular}}\\
\midrule
Full treatment      &       0.007   &       0.126   &      -0.142   &       0.010   &      -0.093   &       0.125   \\
                    &     (0.076)   &     (0.139)   &     (0.145)   &     (0.124)   &     (0.142)   &     (0.121)   \\
Constant            &      -0.006   &      -0.018   &      -0.014   &       0.053   &       0.002   &       0.081   \\
                    &     (0.053)   &     (0.093)   &     (0.114)   &     (0.099)   &     (0.101)   &     (0.091)   \\
\midrule
N                   &         187   &         187   &         187   &         187   &         187   &         187   \\
R$^{2}$             &       0.481   &       0.328   &       0.210   &       0.398   &       0.276   &       0.462   \\
Adjusted p-value (FT)&       0.930   &       0.610   &       0.610   &       0.937   &       0.643   &       0.610   \\
\bottomrule
\end{tabular}
\end{table}
